csv文件中月份加年份R需要哪种格式才能在ggplot2的x轴上显示

Question

I am trying to create a heat map showing data per month for 2 years, with Months on X axis and districts on y axis where as number as "fill".

My data is

Month        District          Number
Jan-17       Lahore            10
Feb-17       Lahore            15
Mar-17       Lahore            2
Apr-17       Lahore            7
May-17       Lahore            8
Jun-17       Lahore            9
Jul-17       Lahore            20
Aug-17       Lahore            13
Sep-17       Lahore            22
Oct-17       Lahore            14
Nov-17       Lahore            5
Dec-17       Lahore            5
Jan-18       Lahore            19
Feb-18       Lahore            21
Mar-18       Lahore            2
Apr-18       Lahore            17
May-18       Lahore            18
Jun-18       Lahore            12
Jul-18       Lahore            9
Aug-18       Lahore            1
Sep-18       Lahore            1
Oct-18       Lahore            1  

The data is just showing one district/City. In my data i have 6 districts.The command i used is:

ggplot(HEAT_MAP2, aes(x = Month, y = District, fill = Number)) +
  geom_tile() +
  scale_x_date(date_labels = "%b%Y") +
  scale_fill_gradient(low = "white", high = "darkgreen", name = "Your Legend")

But it's giving error

Error: Discrete value supplied to continuous scale

How can I remove this error to achieve the graph i am looking for.
Your help will be highly appreciated

Answer 1

This is a common problem: the issue is that Month + Year is not a date. A date requires day, month and year.

The simplest solution is to add the first day of each month, so as Month can be converted to a date. Something like this:

library(dplyr)
library(ggplot2)

HEAT_MAP2 %>% 
  mutate(Date = as.Date(paste0("01-", Month), "%d-%b-%y")) %>% 
  ggplot(aes(x = Date, y = District, fill = Number)) +
    geom_tile() +
    scale_x_date(date_labels = "%b%Y") +
    scale_fill_gradient(low = "white", high = "darkgreen", name = "Your Legend")